Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Employee Benefits [Abstract]

Components of net periodic benefit cost

	Three Months Ended March 31,
	Pension Plans						Postretirement Welfare Plan
(Dollars in Millions)	2012			2011			2012			2011
Service cost	$	32		$	30		$	1		$	1
Interest cost		42			42			2			2
Expected return on plan assets		(48	)		(52	)		—			(1	)
Prior service cost (credit) and transition obligation (asset) amortization		(1	)		(2	)		—			—
Actuarial loss (gain) amortization		40			31			(2	)		(1	)
Net periodic benefit cost	$	65		$	49		$	1		$	1